Yeah, it's been around for quite awhile. I just don't think it really caught on. Understandable since there isn't really a decent third-party promotion of it or anything. Doesn't seem particularly crowded now either. The XP events seem to be more like 3x or 4x although they just go for a few hours on weekend nights. I don't appreciate them so much for the leveling, which is already fast, so much as for the skill training boost.
You say sailors, but you don't mean just any sailor, do you?